When it comes to NIntendo hw decisions, its not just about power, but power consumption as well as form factor. Nintendo does not want a big hulking box around the tv, they prefer a low profile that blends in your living space without taking up much room. This is another reason why ditching optical media for card reader/mini cartridge, will help the chances of Nintendo cramming as much power possible in the NX home version. Think a modern GCN.
But from the beginning of NX talks, I've said Nintendo is simply going to raise the handheld/portable standard to HD, and not push the home console power that much. That means NX handheld will be around Wii U level powr, and the home NX sub XB1 level. That power gap should be convenient for devs in serving crossbuy aka Fusion.
There may be other versions or upgrades down the line, but this is what I see in the first couple years of the NX era.
